Cadmium Hexacyanoiridate(III) Dodecahydrate

Single crystals of tricadmium bis[hexacyanoiridate(III)] dodecahydrate, Cd₃[Ir(CN)₆]₂.12H₂O, were synthesized by the `slow-diffusion U-tube' method. The disordered structure crystallizes in the cubic space group Fm m (No. 225) with a lattice constant of 10.848 (1) Å and one-and-a-third molecules in the unit cell. Divalent Cd atoms are linked to the Ir atoms by linear cyanide bridges. When disorder occurs, cavities are formed and a water molecule, O2, replaces an Ir atom, and a cyanide bridge is replaced with a coordinated water molecule, O1. A hydrogen bonding network is set up between O1, O2, and O3 within the cavities of the crystal lattice. Dehydration and IR studies were conducted on single crystals of the title compound. The compound is isostructural with the dodecahydrates of Cd₃[Co(CN)₆]₂ and Mn₃[Co(CN)₆]₂.

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